RAW: https://e-hentai.org/g/1289224/0e9461931e/
This artist really draws some of the sexiest Touhou girls.
By the way, I found a promotional artwork for this Doujinshi on the artist's twitter, so I added it at the end (https://www.pixiv.net/en/artworks/70598446).
Fixed one image that I uploaded the wrong version of. It was really minor, just bothered me.

Wait, that last panel insinuates sort of rape to me (not that I care) because if it gives someone amnesia she might've done this loads of times to him or am I reading that wrong?

Base +9, dj756 +6, SkullDraecos +4, Atzumo +6

@cyrukus

Considering her smirk in the bottom panel of page 4, this is definitively all planned by her and is probably not the first time she did it like you said.

Base +9, hujkl +17, Zelinko +9, as102 +11, nasilacus +6, SkullDraecos +4, Atzumo +6, lazorboy96 +6

@cyrukus Well she does say she does this occasionally, but obviously she's never done it with him considering her reaction to seeing his dick for the first time.

Base +2, Weissrock +6, sable1 +24, Yesman71 +9, HK-50 +7, velocity606 +5, qix03 +6, nasilacus +6, SkullDraecos +4, Atzumo +6, lazorboy96 +6, k_2553472 +6

The girl being the one drugging the male is doing things to me

Guess we learn something new everyday huh

Base +6, Zelinko +9, nasilacus +6, StratoSquir +6, SkullDraecos +4, Atzumo +6, lazorboy96 +6, Zombine +6

Plot twist: Udonge does this to every guy she encounters during her medicine runs.

Base +7, nasilacus +6, SkullDraecos +4, lazorboy96 +6

KONPEKO KONPEKO KONPEKO

Base +6, tsuza -8, Shepardus -6, velocity606 -5, MANTOR562 -11, kannushi -6, Gabs999 +6, labematuer -6, xige12138 -6, lwx23333 -6, Xalren525 -6, Captn9087 -7, FerKing -7, and 4 more...